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Experiment with CPU-copied overlay discovery

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Co-authored-by: douglasjv <vanderveerdouglas@gmail.com>
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Codex
2026-07-14 10:00:46 -07:00
committed by Matthew Stanley
parent b94722d846
commit 347b6ffb01
2 changed files with 13 additions and 0 deletions
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docs/internal/upstream/douglas-pr15-cpu-copied-overlay-discovery.md
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# CPU-copied overlay discovery experiment
Source: [PSXRecomp PR #15](https://github.com/mstan/psxrecomp/pull/15),
commit [`df7d1faa5f27be0ba357463a763c77efc43e1f91`](https://github.com/douglasjv/psxrecomp-tweaks/commit/df7d1faa5f27be0ba357463a763c77efc43e1f91).
This branch isolates the broad dispatch fallback used for overlays copied by
guest CPU stores. It is experimental because any dispatch above the configured
overlay floor becomes interpreter-eligible; the macOS GL and debug-input parts
of the source commit are excluded.
runtime/src/memory.c
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@@ -510,6 +510,10 @@ int dirty_ram_is_dirty(uint32_t phys) {
if (phys >= RAM_SIZE) return 0;
if (dirty_ram_force_interp() && phys >= DIRTY_RAM_KERNEL_TRACK_BYTES) return 1;
if (dirty_ram_shellwin_interp() && phys >= 0x00030000u && phys <= 0x0005AFFFu) return 1;
/* Experimental fallback for overlays copied into their final location by
* ordinary guest CPU stores rather than CD DMA. Dispatch above the static
* image floor is treated as dynamic and validated by the interpreter. */
if (phys >= g_overlay_region_floor) return 1;
uint32_t page = phys >> DIRTY_RAM_PAGE_SHIFT;
return (dirty_ram_bitmap[page >> 5] >> (page & 31u)) & 1u;
}